Figure 3.

Phylogeny comparing odorant receptors (ORs) of Rhyzopertha dominica (red) to those of Anoplophora glabripennis (blue), Tribolium castaneum (yellow), and Nicrophorus vespilloides (orange), rooted with the conserved co-receptor Orco lineage. Colored circles at nodes represent Shimodaira-Hasegawa support values, shaded from black (0–0.5) to white (1.0). Black arcs describe the known subfamilies of coleopteran ORs (1–7). Some large lineage-specific expansions of ORs have been collapsed for clarity; identities of the removed genes are listed next to the collapsed sector.